function formatTime(date) {
  var year = date.getFullYear()
  var month = date.getMonth() + 1
  var day = date.getDate()

  var hour = date.getHours()
  var minute = date.getMinutes()
  var second = date.getSeconds()


  return [year, month, day].map(formatNumber).join('/') + ' ' + [hour, minute, second].map(formatNumber).join(':')
}

function formatNumber(n) {
  n = n.toString()
  return n[1] ? n : '0' + n
}

let rangeArray = (start, end) => Array(end - start + 1).fill(0).map((v, i) => i + start)
function getRandomArr(start, end) {
  let range = rangeArray(start, end)
    , random = []
  while (range.length) {
    let i = Math.random() * range.length | 0
    random.push(range[i])
    range.splice(i, 1)
  }
  return random
}
module.exports = {
  formatTime: formatTime,
  getRandomArr: getRandomArr
}
